Canon 10D User Guide (en)

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You can reduce noise that arises in JPEG and TIFF images that have 
been shot at night or with a high ISO speed.
1
Select the [NR] tab sheet on the tool palette.
2
Adjust an image.
Reducing Noise
Drag the slider right
3
.
¿
Noise reduction is applied to the image and the image is 
redisplayed.
4
The image is displayed enlarged in the [100% view] 
or [200% view].
¿
You can check the noise reduction effect.
O
In the [50% view] or [Fit to window] display, it is difficult to check 
the noise reduction effect, so noise reduction is not applied.
Noise reduction is applied when the image is displayed enlarged in 
the [100% view] or the [200% view] in the edit window or the edit 
image window. It is not applied in the [50% view] or the [Fit to window] 
display or any other window as the noise reduction effect is difficult to 
check.
To check the noise reduction effect, enlarge the image and 
display it
O
If [Chrominance noise reduction] has been set, color bleeding 
may occur along with reduction of noise. 
O
For a list of tool palette functions, refer to 
.